JPH0318762Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a speed reducer.

[Conventional technology]

Large swing devices such as cranes have large swing forces, so as shown in Figure 3,
Two reducers 03 on the left and right are often used. In the figure, 01 is the crane body, 02 is the actuator, 04 is the swing bearing (outer race), 05 is the swing bearing (inner race), and 06 is the fixed post (pedestal).

The reasons for this are: (1) The transmission force between the reducer and the slewing ring gear is large (that is, the tangential force is large), so it is necessary to keep the tangential force below the allowable tangential force, which is a constraint on the strength of the slewing ring gear, so multiple units are required. It is necessary to use a speed reducer.

(2) In this case, each reducer should have its own drive source (actuator) to avoid unbalanced transmission loads caused by mechanical and accuracy issues, and the control system should also be devised to balance the loads. I'm having a hard time.

[Problem that the invention attempts to solve]

However, the above method has the following drawbacks.

(1) Since there are two reducers, the installation space becomes larger.

(2) In order to balance the load, each of the two reducers requires an actuator. Furthermore, as for the control system, in the case of electro-hydraulic drive, Fig. 4,
In the case of driving by a DC motor, FIG. 5 shows the case.
In the case of electro-hydraulic drive, the piping is complicated, and in the case of DC motor drive, each motor is connected in series and driven with half the supply voltage, so the output of the motor is reduced to half. However, there are some major drawbacks.

[Means for solving problems]

The purpose of this invention is to eliminate the above-mentioned drawbacks and provide a speed reducer that has two output shafts that can balance the load with one actuator.Its features include one input shaft and two In a reducer having an output shaft of An output shaft with a pinion is provided, which includes a plurality of pins connected via spherical bearings, an outer race of the spherical bearing loosely fitted to the pinion disk, a large gear meshing with the pinion, and a pinion transmitting output. It is.

[Effect]

In this case, the two output shafts equalize the transmission force of the left and right output shafts by a torsion mechanism, that is, a load balance mechanism, consisting of each disk and a pin provided with a spherical bearing.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view showing an embodiment of the device according to the present invention, and FIG. 2 is an explanatory view showing the twistable mechanism of the section d in FIG. 1.

In FIG. 1, a is an actuator, b is a speed reducer 1, c is a speed reducer 2, and d is a twistable mechanism.

In FIG. 2, large gears 2, 2' are keyed to output shafts 1, 1' with pinions, respectively. Pinions 4, 4' which can rotate on the input shaft 3 are meshed with the large gears 2, 2'. pinion 4,
Pinion disks 5 and 5' are bolted to 4'. On the other hand, a center disk 6 is keyed to the input shaft 3.

Pinion disk 5, 5' and center disk 6
are connected at two or three locations by pins 7 and spherical bearings 8, 8'. In addition, the spherical bearing 8'
The outer race is loosely engaged with the pinion disks 5, 5' and is structured to be able to move freely in the axial direction. In other words, it constitutes a twistable mechanism. Note that 9 is a bearing.

The operation in the case of the above configuration will be described.

The transmission force of the input shaft 3 is transmitted through the center disk 6, pin 7, pinion disks 5, 5', pinion 4,
4' and large gears 2, 2' to the pinion-equipped output shafts 1, 1', respectively. The pinion-equipped output shafts 1, 1' mesh with large gears of the same slewing bearing, and rotational force is transmitted from each pinion-equipped output shaft to the slewing bearing.

Now, the output shaft with pinion 1, 1' and the large gear of the swing bearing, furthermore, the large gear 2, 2' and the pinion 4,
Even if there is a difference in meshing point (phase difference) between the pinions of the pinion-equipped output shafts 1 and 1' due to gear backlash, center-to-center distance errors, dimensional accuracy errors, etc. , 5' and the pin 7 provided on the center disk 6 and the spherical bearings 8, 8', the output shafts 1, 1' with pinions can transmit rotational force with the same capacity, respectively. Become. That is, it is possible to balance the load by the twistable mechanism.

On the other hand, if the pin 7 and spherical bearings 8 and 8' are not provided and the pinion disk and center disk rotate at the same time, the rotation speed will be transmitted only by the output shaft with pinion on one side due to the difference in meshing points (phase difference) mentioned above. As a result, the intended purpose cannot be achieved.

In addition, in the twistable mechanism, if the force is unevenly transmitted to the left and right output shafts due to errors in gear processing accuracy and bearing mounting accuracy, the pins connected to each disk will escape from the side with the stronger force. As a result, the three disks are out of phase and become twisted, and this twisting creates an effect that equalizes the meshing force between the left and right large gears and the pinion. This action equalizes the transmission force between the left and right output shafts.

[Effect of idea]

The above case has the following effects.

Conventionally, due to restrictions on the strength of the gears of the swing bearing, two separate reducers and actuators were required, but with the present invention, the reducer and actuator can be reduced to one, resulting in the following advantages.

(a) Reduction in equipment installation space.

(b) Cost advantage.

(c) The entire device can be made more compact.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an embodiment of the device according to the present invention, Fig. 2 is an explanatory diagram showing the twistable mechanism of Fig. 1, Fig. 3 is an explanatory diagram showing a conventional device, and Fig. 4 is an explanatory diagram showing the conventional device. FIG. 5 shows a control device for an electro-hydraulic drive. Similarly, FIG. 5 shows a control device for a DC motor drive. 1, 1'... Output shaft with pinion, 2, 2'... Large gear, 3... Input shaft, 4, 4'... Pinion, 5,
5'...Pinion disk, 6...Center disk, 7...Pin, 8, 8'...Spherical bearing.

Claims (1)

[Scope of utility model registration request] In a reducer having one input shaft and two output shafts, a center disk connected to the input shaft, a pinion disk connected to a pinion placed between the center disk and into which the input shaft is inserted, and the above-mentioned A plurality of pins are provided to connect the center disk and the pinion disk via spherical bearings, an outer race of the spherical bearing is loosely fitted to the pinion disk, a large gear that meshes with the pinion, and a pinion that transmits output. A speed reducer characterized by having an output shaft with a pinion.